Question

the power of the lens is -4 D. analyes it's character

Answer 1

Explanation:

The power of a lens is defined as the reciprocal of its focal length in meters, or D = 1/f, where D is the power in diopters and f is the focal length in meters. Lens surface power can be found with the index of refraction and radius of curvature.Power of lens is the ability of the lens to converge the rays of light falling on it. It can also be defined as P=1/f where f is the focal length. ... Dioptre is the S I unit of power of lens. One Dioptre is the power of a lens whose focal length is 1 metre.

Answer 2

Answer:

$p = \frac{1}{f}$

$p = - 4 \: diopter$

The power -4D tell us that the lens is concave .A concave lens has negative focal length hence it has negative power.It produce diminished image and visual image .It diverges all the parallel rays of light .